In addition to all of the good suggestions above, I would add, find some music that you can really sink your teeth in to, and do a deep, deep dive. I take a cue from the cello master Pablo Casals. Now, I will never come close to being one quadrillionth the musician that he was, but I read about one of his practice regimens that I have somewhat incorporated into my practice routine.
Casals is credited with having rediscovered the Bach Suites for Unaccompanied Cello, when he was a young man rummaging through some old music in a shop in Barcelona in the early 20th Century. He became the master of them. His routine was to play one of the six suites (all five parts, preludes and dances) in rotation, everyday of his long life.
The cello suites are magnificent pieces of music. There is more than a lifetime’s worth of musical, intellectual and emotional exploration to be had.
I don’t play a full suite each day, but I do play parts of them pretty much every day. I play them on electric fretted or fretless, or on upright depending on which instrument I’m focusing on at the time. There is a joy (as well as frustration then joy) in learning and living with such pieces. Each time you play them you will learn something new, either about them or about yourself. It is only one part of my practice, but a part that I think I benefit from greatly. Most of the pieces have a few double and some triple stops, but mostly the musical lines are linear with the harmonies, counterpoint and polyphony being implied. Bach can teach us a lot about bass playing. I think it was John Entwhistle who said that Bach was the governor for all bassists.
I would recommend the cello suites to anyone, but it doesn’t have to be your muse. Just find some music in which you can find deep meaning, and live with it and really explore all of its nuances.
Good luck, and have fun!
What do you do with the 4th and 5th suites, I have them on sheet music but they are in Eflat and D minor? it looks like, the low Eflat isn't a thing on my 4 string.
Just curious if you transpose those notes?
I've read through all of Suite #1, most of 2 and parts of Suite 3.
Boy does it get harder, 4,5 and 6 are beasts!